The out interface refers to the output interface. Other common ones are audio input jack, AUX, auxiliary input, TUNE and radio head input. Power amplifier, referred to as power amplifier, generally refers to one of the most basic devices in audio system, commonly known as "amplifier". Its task is to amplify the professional audio system from the signal source and the weak electrical signal from the mixer, and drive the speaker to make sound. It can also refer to other devices used for power amplification.

The meaning of output and input interfaces

The switch IN on the mobile power supply represents the input, which is the charging interface of the mobile power supply. OUT stands for output, that is, the output interface of mobile power supply to charge other devices. The Chinese translation of in is access, which is used as the annotation of input interface in mobile power supply. When the mobile power supply is insufficient, it can be charged by connecting the interface corresponding to English words through the data cable.

The Chinese translation of OUT is to go out and use it as an output interface in mobile power supply. When the power of other devices is low, the data cable can be connected to the interface corresponding to English words to charge other devices with low power.